Just out of curiosity, how would a screen break without being mishandled? And if the manufacturer, retailer or delivery company mishandle a device, wouldn't you notice that when you use the device for the first time? Why would you need 6 months?

+1, because there is nearly no way to build a device in a way it breaks after a longer time. Except from pressure from the outside (pet / kid / glass of water...) the only way I can imagine to crack it is a tension inside due to sloppy assembling, but this would appear in the first few days of usage, and even Pocketbook (Germany) replaced readers when this happened.